X-ray Diffraction of Dust Particles in Spring Beijing
ZHENG Nan
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, China; School of Earth and Space Sciences, Peking University, Beijing 100871
State Key Laboratory for Environmental Simulation and Pollution Control, College of Environmental Science and Engineering, Peking University, Beijing 100871
Search for more papers by this authorCorresponding Author
WANG Hejin
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, China; School of Earth and Space Sciences, Peking University, Beijing 100871
Corresponding author. E-mail: [email protected]Search for more papers by this authorXU Tingjing
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, China; School of Earth and Space Sciences, Peking University, Beijing 100871
Search for more papers by this authorLI Ting
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, China; School of Earth and Space Sciences, Peking University, Beijing 100871
Search for more papers by this authorZHENG Nan
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, China; School of Earth and Space Sciences, Peking University, Beijing 100871
State Key Laboratory for Environmental Simulation and Pollution Control, College of Environmental Science and Engineering, Peking University, Beijing 100871
Search for more papers by this authorCorresponding Author
WANG Hejin
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, China; School of Earth and Space Sciences, Peking University, Beijing 100871
Corresponding author. E-mail: [email protected]Search for more papers by this authorXU Tingjing
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, China; School of Earth and Space Sciences, Peking University, Beijing 100871
Search for more papers by this authorLI Ting
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, China; School of Earth and Space Sciences, Peking University, Beijing 100871
Search for more papers by this authorAbstract:
X-ray diffractometry was utilized to study the mineralogical characteristics of the inhalable particles (PM10) sampled during two dust storms in Beijing city on March 18th and May 21st, 2008. We confirm, for the first time, that there stably exists ammonium chloride in the atmosphere when temperature is low. The total sulfates particles were affected by relative humidity. Both species and concentration of sulfates decreased first and then grew back by the end of each dust storm. Koninckite, a phosphate mineral never reported as particulate aerosol before, was identified. Meanwhile, our result shows that a chemical modification on dust minerals occurs during long range transportation. PM10 samples collected during the period of dust storms were dominated by crustal minerals such as quartz, illite/ smectite, illite, chlorite, feldspar and calcite, and were notably higher in concentration than that in normal periods of time. The amounts of total sulfates, calcite and feldspar altered in each dust storm. It is derived from 24-hour isentropic backward trajectories that two dust events in spring 2008 originated in different sources.
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